.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
  flex-shrink: 0;
}

.header-inner {
  max-width: 1400px;
  height: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.header-brand {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.01em;
  justify-self: start;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  justify-self: center;
}

.header-nav-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 4px;
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.header-nav-item svg {
  flex-shrink: 0;
}

.header-nav-item:hover {
  color: var(--text);
}

.header-nav-item.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
}

.header-admin-btn {
  padding: 8px 18px;
  border: 1.5px solid var(--primary);
  border-radius: 24px;
  background: transparent;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.header-admin-btn:hover {
  background: var(--primary-light);
}

.header-icon-btn {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}

.header-icon-btn:hover {
  background: var(--surface-2);
  color: var(--text);
}

.header-avatar {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: #e8e8e8;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.header-avatar:hover {
  background: #ddd;
}

@media (max-width: 900px) {
  .header-inner {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    height: auto;
    padding: 12px 16px;
    gap: 12px;
  }

  .header-brand {
    grid-column: 1;
    grid-row: 1;
    font-size: 1.15rem;
  }

  .header-actions {
    grid-column: 2;
    grid-row: 1;
  }

  .header-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: start;
    gap: 16px;
    overflow-x: auto;
  }

  .header-nav-item span {
    white-space: nowrap;
  }

  .header-admin-btn {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-nav-item span {
    font-size: 0.85rem;
  }
}